Tutorials and How-tos/Troubleshooting DLNA
Taken from the forum topic: DLNA 
If your DLNA folders do not show up in your client software. Here are a few tips to troubleshoot.
Execute the following to see if the server process is running.
Check the log file.
tail -f /var/log/minidlna.log
Check the config file to see if the folder locations are correct.
Make sure the directory permissions have the "other" bits set to read and execute
chmod o=rx video <directory>